What should be done to SN74CB3T16210 unused pins?

Thank you for your support

Thankyou for your support.

Can you let me know how the voltage translation happens for the same chip (SN74CB3T16210) i.e input output detection.

I found  an example of translation using the CB3T in this app note. page 28

http://www.ti.com/litv/pdf/scda008

Hi Chris,

We have checked the page28 example, here they are using pullup resistor in the output signals? what for these resistors?

In our design we are planning to use this device for 2.5V to 3.3V conversion with VCC=3.3V. So is it must to add pull resistor in the 3.3V side for all the IO pins?

Regards,

Pradap

The resistors are needed if you are going both directions.

 If you are only going one direction and Vcc is 3.3V then the resistors are not needed.

Hi Chris,

   Thankyou for your reply. We are using this device for single direction conversion only (2.5V input to 3.3V output signals). 

   But I asked this question because  11th page app note  tells like below,

   "One important consideration is that the bus switch can be used only for down translation, i.e., high to low level. For low- to high-level translation, additional components (for example, pullup resistors) are required."

Regards,

Pradap

Since your input is less than 1V below Vcc It will translate up to Vcc. So you are Ok.